It is prohibited by the nation's Constitution which overrules all contained regions. The contained regions can add further restrictions, not lower them.
The Supreme Court has over multiple cases recognized that the collection of mass digital information can implicate Fourth Amendment protections.
Here is the foundational line:
> "The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized."
It clearly says: The right of the people to to be secure in their persons and effects against unreasonable searches shall not be violated.
Well the problem comes down to what is considered "unreasonable searches". When I think "surveillance", I think cameras on cars that photograph everything they pass by. The courts have again and again considered those to be reasonable with no expectations of privacy. And the trucks in this article are doing exactly that.
Uhh FalcoNet doesn't photograph cars. It snoops telecom traffic. And no, SCOTUS has certainly not found that the government is allowed to just arbitrarily snoop telecom traffic.